Is v0.dev code less secure than hand-written code?

v0-generated code is not inherently less secure than hand-written code at the UI component level, as it produces standard React patterns that follow established conventions. The security gap appears because v0 generates only the presentation layer without the security infrastructure that experienced developers typically build alongside it. Hand-written code by a security-aware developer would include input validation, error handling, CSP headers, and authentication checks from the start. The real risk is that v0 makes it easy to ship a polished-looking application that appears complete but lacks critical security layers. UNPWNED evaluates the actual security posture of any web application, helping teams identify gaps whether the code was generated by AI or written by hand.